needn't与don't need to怎么用,两者有没有什么被动语态之类的关系?

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needn't与don't need to怎么用,两者有没有什么被动语态之类的关系?
needn't与don't need to怎么用,两者有没有什么被动语态之类的关系?

needn't与don't need to怎么用,两者有没有什么被动语态之类的关系?
needn't中的need是个情态动词,所以它的后面应该加动词原形.
don't need to中的need是实意动词,所以应该跟need to do sth.的词组.

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need有两种词性
1.情态动词.用法和can一样后面直接跟动词原形.情态动词否定是后面直接加not, 所以needn't是情态动词.无被动语态.
举例.你不需要向他请求帮助.

You needn't ask to him for help.
2.实义动词.就是我们经常用的like, wash , play等动词.具有实际意义.
所以在否定时前面得加助动词，也就是前面得加don't,didn't啊之类的，看时态.
一般用法是 need to do sth.
你需要休息一下. You need to take a rest.
你不需要休息. You don't need to take a rest.
但是需注意的是表被动时用need doing来表示.
比如你的自行车需要修理.因为车子是被修理.是被动
Your bike needs repairing.

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